Airwell AW-WHPMA18-H93 Manual de usuario

TECHNICAL MANUAL

WELLEA MONOBLOC DF

R32

21.AW.WELLEA.MONO.DF.R32.TM.EN.22.02

AW-WHPMA18-H93

AW-WHPMA22-H93

AW-WHPMA26-H93

AW-WHPMA30-H93

CONTENTS

Part 1 General Information............................................................................ 3

Part 2 Engineering Data ............................................................................... 19

Part 3 Installation and Field Settings.......................................................... 39

Part 1 - General Information

Part 1

General Information

1 Wellea Mono DF System............................................................................ 4

2 Unit Capacities ........................................................................................... 6

3System Design and Unit Selection .............................................................. 7

4Typical Applications ................................................................................... 9

1 Wellea Mono DF System

1.1 System Schematic

Figure 1-1.1: System schematic

Wellea Mono DF is an integrated air-to-water space heating, space cooling and domestic hot water heat pump system.

Wellea Mono DF Outdoor Unit

Distributor

The outdoor heat pump system extracts heat from the outdoor air and transfers this heat trought refrigerant piping

to the plate heat exchanger in the hydronic system. The heated water in the hydronic system circulates to low

temperature heat emitters (floor heating loops or low temperature radiators) to provide space heating, and to the

domestic hot water tank to provide domestic hot water. The 4-way valve in the outdoor unit can reverse the

refrigerant cycle so that the hydronic system can provide chilled water for cooling using fan coil units.

Wellea Mono DF is an integrated air to water heat pump system which is one-stop solution for space heating, space

cooling and domestic hot water. The outdoor heat pump system extracts heat from the outdoor air and transfers this

heat through refrigerant piping to the plate heat exchanger in the hydronic system. The heated water in the

hydronic system circulates to low temperature heat emitters (floor heating loops or low temperature

radiators) to provide space heating, and to the domestic hot water tank to provide domestic hot water. The 4-way

valve in the outdoor unit can reverse the refrigerant cycle so that the hydronic system can provide chilled water for

cooling using fan coil units.

The heating capacity of heat pumps decreases with ambient temperature dropping. Wellea Mono DF can be

equipped with a backup electric heater to provide additional heating capacity for use during extremely cold

weather when the heat pump capacity is insufficient. The backup electric heater also serves as a backup in case of

heat pump malfunction and for anti-freeze protection of the outside water piping in winter.

Part 1 - General Information

1.2 System Configurations

Wellea Mono DF can be configured to run with the electric heater either enabled or disabled and can also be used in

conjunction with an auxiliary heat source such as a boiler.

The chosen configuration affects the size of heat pump that is required. Three typical configurations are described below.

Refer to Figure 1-1.2.

Configuration 1: Heat pump only

The heat pump covers the required capacity and no extra heating capacity is necessary.

Requires selection of larger capacity heat pump and implies higher initial investment.

Ideal for new construction in projects where energy efficiency is paramount.

Configuration 2: Heat pump and backup electric heater

Heat pump covers the required capacity until the ambient temperature drops below the point at which the heat

pump is able to provide sufficient capacity. When the ambient temperature is below this equilibrium point (as shown

in Figure 1-1.2), the backup electric heater supplies the required additional heating capacity.

Best balance between initial investment and running costs, results in lowest lifecycle cost.

Ideal for new construction.

Configuration 3: Heat pump with auxiliary heat source

Heat pump covers the required capacity until the ambient temperature drops below the point at which the heat

pump is able to provide sufficient capacity. When the ambient temperature is below this equilibrium point (as shown

in Figure 1-1.2), depending on the system settings, either the auxiliary heat source supplies the required additional

heating capacity or the heat pump does not run and the auxiliary heat source covers the required capacity.

Enables selection of lower capacity heat pump.

Ideal for refurbishments and upgrades.

Figure 1-1.2: System configurations

2 Unit Capacities

Table 1-2.1: Unit capacities range and appearances

Capacity 18kW 22kW 26kW 30kW

Model

AW-WHPMA18-H93 AW-WHPMA22-H93 AW-WHPMA26-H93 AW-WHPMA30-H93

Appearance

Part 1 - General Information

3 System Design and Unit Selection

3.1 Selection Procedure

Step 1: Total heat load calculation

Calculate conditioned surface area

Select the heat emitters (type, quantity, water temperature and heat load)

Step 2: System configuration

Decide whether to include AHS and set AHS’s switching temperature

Decide whether backup electric heater is enabled or disabled

Step 3: Selection of outdoor units

Determine required total heat load on outdoor units

Set capacity safety factor

Select power supply

Provisionally select Wellea Mono DF unit capacity based on nominal

capacity

Correct capacity of the outdoor units for the following items:

Outdoor air temperature / Outdoor humidity / Water outlet temperature1/

Altitude / Anti-freeze fluid

Is corrected Wellea Mono DF unit capacity ≥Required total heat load

on outdoor units2

Yes

Wellea Mono DF system

selection is complete

Select a larger model or enable

backup electric heater operation

Notes:

1. If the required water temperatures of the heat emitters are not all the same, the Wellea Mono’s outlet water temperature setting should be set at the

highest of the heat emitter required water temperatures. If the water outlet design temperature falls between two temperatures listed in the

outdoor unit's capacity table, calculate the corrected capacity by interpolation.

2. Select Mono units which should satisfy both total heating and cooling load requirements.

3.2 Wellea Leaving Water Temperature (LWT) Selection

The recommended design LTW ranges for different types of heat emitter are:

For floor heating: 30 to 35⁰C

For fan coil units: 30 to 45⁰C

For low temperature radiators: 40 to 50⁰C

3.3 Optimizing System Design

To get the most comfort with the lowest energy consumptionwith Wellea, it is important to take account of the

following considerations:

Choose heat emitters that allow the heat pump system to operate at as low a hot water temperature as possible

whilst still providing sufficient heating.

Make sure the correct weather dependency curve is selected to match the installation environment (building

structure, climate) as well as ender user’s demands.

Connecting room thermostats (field supplied) to the hydronic system helps prevent excessive space heating by

stopping the outdoor unit and circulator pump when the room temperature is above the thermostat set point.

Part 1 - General Information

4 Typical Applications

4.1 Space Heating

The room thermostat is used as a switch. When there is a heating request from the room thermostat, the Mono unit

operates to achieve the target water temperature set on the user interface. When the room temperature reaches the

thermostat’s set temperature, the unit stops.

Figure 1-5.1: Space heating

Table 1-5.1: Space heating

Legend

Outdoor unit

Room thermostat (field supplied)

1.1

Manometer

Drain valve (field supplied)

1.2

Pressure relief valve

Fill valve (field supplied)

1.3

Expansion vessel

Balance tank (field supplied)

1.4

Plate heat exchanger

8.1

Air purge valve

1.5

Air purge valve

8.2

Drain valve

1.6

Flow switch

Expansion vessel (field supplied)

1.7

P_i: Circulation pump inside the unit

P_o: Outside circulation pump (field supplied)

Y-shape filter

Collector / Distributor (field supplied)

Stop valve (field supplied)

FHL 1...n

Floor heating loop (field supplied)

Wired controller

Notes:

1. The example is just for application illustration; please confirm the exact installation method according to the installation manual.

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